699 lines
22 KiB
PHP
699 lines
22 KiB
PHP
<?php
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/**
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* @file
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* Contains the SearchApiDataSourceControllerInterface as well as a default base class.
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*/
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/**
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* Interface for all data source controllers for Search API indexes.
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*
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* Data source controllers encapsulate all operations specific to an item type.
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* They are used for loading items, extracting item data, keeping track of the
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* item status, etc.
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*
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* All methods of the data source may throw exceptions of type
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* SearchApiDataSourceException if any exception or error state is encountered.
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*/
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interface SearchApiDataSourceControllerInterface {
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/**
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* Constructor for a data source controller.
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*
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* @param $type
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* The item type for which this controller is created.
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*/
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public function __construct($type);
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/**
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* Return information on the ID field for this controller's type.
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*
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* @return array
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* An associative array containing the following keys:
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* - key: The property key for the ID field, as used in the item wrapper.
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* - type: The type of the ID field. Has to be one of the types from
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* search_api_field_types(). List types ("list<*>") are not allowed.
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*/
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public function getIdFieldInfo();
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/**
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* Load items of the type of this data source controller.
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*
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* @param array $ids
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* The IDs of the items to laod.
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*
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* @return array
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* The loaded items, keyed by ID.
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*/
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public function loadItems(array $ids);
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/**
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* Get a metadata wrapper for the item type of this data source controller.
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*
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* @param $item
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* Unless NULL, an item of the item type for this controller to be wrapped.
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* @param array $info
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* Optionally, additional information that should be used for creating the
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* wrapper. Uses the same format as entity_metadata_wrapper().
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*
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* @return EntityMetadataWrapper
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* A wrapper for the item type of this data source controller, according to
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* the info array, and optionally loaded with the given data.
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*
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* @see entity_metadata_wrapper()
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*/
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public function getMetadataWrapper($item = NULL, array $info = array());
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/**
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* Get the unique ID of an item.
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*
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* @param $item
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* An item of this controller's type.
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*
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* @return
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* Either the unique ID of the item, or NULL if none is available.
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*/
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public function getItemId($item);
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/**
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* Get a human-readable label for an item.
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*
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* @param $item
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* An item of this controller's type.
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*
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* @return
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* Either a human-readable label for the item, or NULL if none is available.
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*/
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public function getItemLabel($item);
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/**
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* Get a URL at which the item can be viewed on the web.
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*
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* @param $item
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* An item of this controller's type.
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*
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* @return
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* Either an array containing the 'path' and 'options' keys used to build
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* the URL of the item, and matching the signature of url(), or NULL if the
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* item has no URL of its own.
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*/
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public function getItemUrl($item);
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/**
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* Initialize tracking of the index status of items for the given indexes.
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*
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* All currently known items of this data source's type should be inserted
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* into the tracking table for the given indexes, with status "changed". If
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* items were already present, these should also be set to "changed" and not
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* be inserted again.
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*
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* @param array $indexes
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* The SearchApiIndex objects for which item tracking should be initialized.
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*
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* @throws SearchApiDataSourceException
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* If any of the indexes doesn't use the same item type as this controller.
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*/
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public function startTracking(array $indexes);
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/**
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* Stop tracking of the index status of items for the given indexes.
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*
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* The tracking tables of the given indexes should be completely cleared.
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*
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* @param array $indexes
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* The SearchApiIndex objects for which item tracking should be stopped.
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*
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* @throws SearchApiDataSourceException
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* If any of the indexes doesn't use the same item type as this controller.
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*/
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public function stopTracking(array $indexes);
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/**
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* Start tracking the index status for the given items on the given indexes.
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*
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* @param array $item_ids
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* The IDs of new items to track.
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* @param array $indexes
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* The indexes for which items should be tracked.
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*
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* @throws SearchApiDataSourceException
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* If any of the indexes doesn't use the same item type as this controller.
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*/
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public function trackItemInsert(array $item_ids, array $indexes);
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/**
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* Set the tracking status of the given items to "changed"/"dirty".
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*
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* Unless $dequeue is set to TRUE, this operation is ignored for items whose
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* status is not "indexed".
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*
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* @param $item_ids
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* Either an array with the IDs of the changed items. Or FALSE to mark all
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* items as changed for the given indexes.
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* @param array $indexes
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* The indexes for which the change should be tracked.
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* @param $dequeue
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* If set to TRUE, also change the status of queued items.
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*
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* @throws SearchApiDataSourceException
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* If any of the indexes doesn't use the same item type as this controller.
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*/
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public function trackItemChange($item_ids, array $indexes, $dequeue = FALSE);
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/**
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* Set the tracking status of the given items to "queued".
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*
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* Queued items are not marked as "dirty" even when they are changed, and they
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* are not returned by the getChangedItems() method.
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*
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* @param $item_ids
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* Either an array with the IDs of the queued items. Or FALSE to mark all
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* items as queued for the given indexes.
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* @param SearchApiIndex $index
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* The index for which the items were queued.
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*
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* @throws SearchApiDataSourceException
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* If any of the indexes doesn't use the same item type as this controller.
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*/
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public function trackItemQueued($item_ids, SearchApiIndex $index);
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/**
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* Set the tracking status of the given items to "indexed".
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*
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* @param array $item_ids
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* The IDs of the indexed items.
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* @param SearchApiIndex $indexes
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* The index on which the items were indexed.
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*
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* @throws SearchApiDataSourceException
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* If the index doesn't use the same item type as this controller.
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*/
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public function trackItemIndexed(array $item_ids, SearchApiIndex $index);
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/**
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* Stop tracking the index status for the given items on the given indexes.
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*
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* @param array $item_ids
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* The IDs of the removed items.
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* @param array $indexes
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* The indexes for which the deletions should be tracked.
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*
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* @throws SearchApiDataSourceException
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* If any of the indexes doesn't use the same item type as this controller.
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*/
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public function trackItemDelete(array $item_ids, array $indexes);
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/**
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* Get a list of items that need to be indexed.
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*
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* If possible, completely unindexed items should be returned before items
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* that were indexed but later changed. Also, items that were changed longer
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* ago should be favored.
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*
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* @param SearchApiIndex $index
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* The index for which changed items should be returned.
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* @param $limit
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* The maximum number of items to return. Negative values mean "unlimited".
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*
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* @return array
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* The IDs of items that need to be indexed for the given index.
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*/
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public function getChangedItems(SearchApiIndex $index, $limit = -1);
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/**
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* Get information on how many items have been indexed for a certain index.
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*
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* @param SearchApiIndex $index
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* The index whose index status should be returned.
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*
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* @return array
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* An associative array containing two keys (in this order):
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* - indexed: The number of items already indexed in their latest version.
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* - total: The total number of items that have to be indexed for this
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* index.
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*
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* @throws SearchApiDataSourceException
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* If the index doesn't use the same item type as this controller.
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*/
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public function getIndexStatus(SearchApiIndex $index);
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}
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/**
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* Default base class for the SearchApiDataSourceControllerInterface.
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*
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* Contains default implementations for a number of methods which will be
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* similar for most data sources. Concrete data sources can decide to extend
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* this base class to save time, but can also implement the interface directly.
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*
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* A subclass will still have to provide implementations for the following
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* methods:
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* - getIdFieldInfo()
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* - loadItems()
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* - getMetadataWrapper() or getPropertyInfo()
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* - startTracking() or getAllItemIds()
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*
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* The table used by default for tracking the index status of items is
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* {search_api_item}. This can easily be changed, for example when an item type
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* has non-integer IDs, by changing the $table property.
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*/
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abstract class SearchApiAbstractDataSourceController implements SearchApiDataSourceControllerInterface {
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/**
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* The item type for this controller instance.
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*/
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protected $type;
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/**
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* The info array for the item type, as specified via
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* hook_search_api_item_type_info().
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*
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* @var array
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*/
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protected $info;
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/**
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* The table used for tracking items. Set to NULL on subclasses to disable
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* the default tracking for an item type, or change the property to use a
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* different table for tracking.
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*
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* @var string
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*/
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protected $table = 'search_api_item';
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/**
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* When using the default tracking mechanism: the name of the column on
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* $this->table containing the item ID.
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*
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* @var string
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*/
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protected $itemIdColumn = 'item_id';
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/**
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* When using the default tracking mechanism: the name of the column on
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* $this->table containing the index ID.
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*
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* @var string
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*/
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protected $indexIdColumn = 'index_id';
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/**
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* When using the default tracking mechanism: the name of the column on
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* $this->table containing the indexing status.
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*
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* @var string
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*/
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protected $changedColumn = 'changed';
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/**
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* Constructor for a data source controller.
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*
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* @param $type
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* The item type for which this controller is created.
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*/
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public function __construct($type) {
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$this->type = $type;
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$this->info = search_api_get_item_type_info($type);
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}
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/**
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* Get a metadata wrapper for the item type of this data source controller.
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*
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* @param $item
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* Unless NULL, an item of the item type for this controller to be wrapped.
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* @param array $info
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* Optionally, additional information that should be used for creating the
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* wrapper. Uses the same format as entity_metadata_wrapper().
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*
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* @return EntityMetadataWrapper
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* A wrapper for the item type of this data source controller, according to
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* the info array, and optionally loaded with the given data.
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*
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* @see entity_metadata_wrapper()
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*/
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public function getMetadataWrapper($item = NULL, array $info = array()) {
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$info += $this->getPropertyInfo();
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return entity_metadata_wrapper($this->type, $item, $info);
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}
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/**
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* Helper method that can be used by subclasses to specify the property
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* information to use when creating a metadata wrapper.
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*
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* @return array
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* Property information as specified by hook_entity_property_info().
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*
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* @see hook_entity_property_info()
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*/
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protected function getPropertyInfo() {
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throw new SearchApiDataSourceException(t('No known property information for type @type.', array('@type' => $this->type)));
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}
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/**
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* Get the unique ID of an item.
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*
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* @param $item
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* An item of this controller's type.
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*
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* @return
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* Either the unique ID of the item, or NULL if none is available.
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*/
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public function getItemId($item) {
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$id_info = $this->getIdFieldInfo();
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$field = $id_info['key'];
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$wrapper = $this->getMetadataWrapper($item);
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if (!isset($wrapper->$field)) {
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return NULL;
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}
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$id = $wrapper->$field->value();
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return $id ? $id : NULL;
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}
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/**
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* Get a human-readable label for an item.
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*
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* @param $item
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* An item of this controller's type.
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*
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* @return
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* Either a human-readable label for the item, or NULL if none is available.
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*/
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public function getItemLabel($item) {
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$label = $this->getMetadataWrapper($item)->label();
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return $label ? $label : NULL;
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}
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/**
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* Get a URL at which the item can be viewed on the web.
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*
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* @param $item
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* An item of this controller's type.
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*
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* @return
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* Either an array containing the 'path' and 'options' keys used to build
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* the URL of the item, and matching the signature of url(), or NULL if the
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* item has no URL of its own.
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*/
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public function getItemUrl($item) {
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return NULL;
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}
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/**
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* Initialize tracking of the index status of items for the given indexes.
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*
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* All currently known items of this data source's type should be inserted
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* into the tracking table for the given indexes, with status "changed". If
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* items were already present, these should also be set to "changed" and not
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* be inserted again.
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*
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* @param array $indexes
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* The SearchApiIndex objects for which item tracking should be initialized.
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*
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* @throws SearchApiDataSourceException
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* If any of the indexes doesn't use the same item type as this controller.
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*/
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public function startTracking(array $indexes) {
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if (!$this->table) {
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return;
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}
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// We first clear the tracking table for all indexes, so we can just insert
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// all items again without any key conflicts.
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$this->stopTracking($indexes);
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// Insert all items as new.
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$this->trackItemInsert($this->getAllItemIds(), $indexes);
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}
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/**
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* Helper method that can be used by subclasses instead of implementing startTracking().
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*
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* Returns the IDs of all items that are known for this controller's type.
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*
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* @return array
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* An array containing all item IDs for this type.
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*/
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protected function getAllItemIds() {
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throw new SearchApiDataSourceException(t('Items not known for type @type.', array('@type' => $this->type)));
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}
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/**
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* Stop tracking of the index status of items for the given indexes.
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*
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* The tracking tables of the given indexes should be completely cleared.
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*
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* @param array $indexes
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* The SearchApiIndex objects for which item tracking should be stopped.
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*
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* @throws SearchApiDataSourceException
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* If any of the indexes doesn't use the same item type as this controller.
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*/
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public function stopTracking(array $indexes) {
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if (!$this->table) {
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return;
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}
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// We could also use a single query with "IN" operator, but this method
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// will mostly be called with only one index.
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foreach ($indexes as $index) {
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$this->checkIndex($index);
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$query = db_delete($this->table)
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->condition($this->indexIdColumn, $index->id)
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->execute();
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}
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}
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/**
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* Start tracking the index status for the given items on the given indexes.
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*
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* @param array $item_ids
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* The IDs of new items to track.
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* @param array $indexes
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* The indexes for which items should be tracked.
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*
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* @throws SearchApiDataSourceException
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* If any of the indexes doesn't use the same item type as this controller.
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*/
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public function trackItemInsert(array $item_ids, array $indexes) {
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if (!$this->table) {
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return;
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}
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// Since large amounts of items can overstrain the database, only add items
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// in chunks.
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foreach (array_chunk($item_ids, 1000) as $chunk) {
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$insert = db_insert($this->table)
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->fields(array($this->itemIdColumn, $this->indexIdColumn, $this->changedColumn));
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foreach ($chunk as $item_id) {
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foreach ($indexes as $index) {
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$this->checkIndex($index);
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$insert->values(array(
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$this->itemIdColumn => $item_id,
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$this->indexIdColumn => $index->id,
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$this->changedColumn => 1,
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));
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}
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}
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$insert->execute();
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}
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}
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/**
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* Set the tracking status of the given items to "changed"/"dirty".
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*
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* Unless $dequeue is set to TRUE, this operation is ignored for items whose
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* status is not "indexed".
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*
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* @param $item_ids
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* Either an array with the IDs of the changed items. Or FALSE to mark all
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* items as changed for the given indexes.
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* @param array $indexes
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* The indexes for which the change should be tracked.
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* @param $dequeue
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* If set to TRUE, also change the status of queued items.
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*
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* @throws SearchApiDataSourceException
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* If any of the indexes doesn't use the same item type as this controller.
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*/
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public function trackItemChange($item_ids, array $indexes, $dequeue = FALSE) {
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if (!$this->table) {
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return;
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}
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$index_ids = array();
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foreach ($indexes as $index) {
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$this->checkIndex($index);
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$index_ids[] = $index->id;
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}
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$update = db_update($this->table)
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->fields(array(
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$this->changedColumn => REQUEST_TIME,
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))
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->condition($this->indexIdColumn, $index_ids, 'IN')
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->condition($this->changedColumn, 0, $dequeue ? '<=' : '=');
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if ($item_ids !== FALSE) {
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$update->condition($this->itemIdColumn, $item_ids, 'IN');
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}
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$update->execute();
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}
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/**
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* Set the tracking status of the given items to "queued".
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*
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* Queued items are not marked as "dirty" even when they are changed, and they
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* are not returned by the getChangedItems() method.
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*
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* @param $item_ids
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* Either an array with the IDs of the queued items. Or FALSE to mark all
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* items as queued for the given indexes.
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* @param SearchApiIndex $index
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* The index for which the items were queued.
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*
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* @throws SearchApiDataSourceException
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* If any of the indexes doesn't use the same item type as this controller.
|
|
*/
|
|
public function trackItemQueued($item_ids, SearchApiIndex $index) {
|
|
if (!$this->table) {
|
|
return;
|
|
}
|
|
$update = db_update($this->table)
|
|
->fields(array(
|
|
$this->changedColumn => -1,
|
|
))
|
|
->condition($this->indexIdColumn, $index->id);
|
|
if ($item_ids !== FALSE) {
|
|
$update->condition($this->itemIdColumn, $item_ids, 'IN');
|
|
}
|
|
$update->execute();
|
|
}
|
|
|
|
/**
|
|
* Set the tracking status of the given items to "indexed".
|
|
*
|
|
* @param array $item_ids
|
|
* The IDs of the indexed items.
|
|
* @param SearchApiIndex $indexes
|
|
* The index on which the items were indexed.
|
|
*
|
|
* @throws SearchApiDataSourceException
|
|
* If the index doesn't use the same item type as this controller.
|
|
*/
|
|
public function trackItemIndexed(array $item_ids, SearchApiIndex $index) {
|
|
if (!$this->table) {
|
|
return;
|
|
}
|
|
$this->checkIndex($index);
|
|
db_update($this->table)
|
|
->fields(array(
|
|
$this->changedColumn => 0,
|
|
))
|
|
->condition($this->itemIdColumn, $item_ids, 'IN')
|
|
->condition($this->indexIdColumn, $index->id)
|
|
->execute();
|
|
}
|
|
|
|
/**
|
|
* Stop tracking the index status for the given items on the given indexes.
|
|
*
|
|
* @param array $item_ids
|
|
* The IDs of the removed items.
|
|
* @param array $indexes
|
|
* The indexes for which the deletions should be tracked.
|
|
*
|
|
* @throws SearchApiDataSourceException
|
|
* If any of the indexes doesn't use the same item type as this controller.
|
|
*/
|
|
public function trackItemDelete(array $item_ids, array $indexes) {
|
|
if (!$this->table) {
|
|
return;
|
|
}
|
|
$index_ids = array();
|
|
foreach ($indexes as $index) {
|
|
$this->checkIndex($index);
|
|
$index_ids[] = $index->id;
|
|
}
|
|
db_delete($this->table)
|
|
->condition($this->itemIdColumn, $item_ids, 'IN')
|
|
->condition($this->indexIdColumn, $index_ids, 'IN')
|
|
->execute();
|
|
}
|
|
|
|
/**
|
|
* Get a list of items that need to be indexed.
|
|
*
|
|
* If possible, completely unindexed items should be returned before items
|
|
* that were indexed but later changed. Also, items that were changed longer
|
|
* ago should be favored.
|
|
*
|
|
* @param SearchApiIndex $index
|
|
* The index for which changed items should be returned.
|
|
* @param $limit
|
|
* The maximum number of items to return. Negative values mean "unlimited".
|
|
*
|
|
* @return array
|
|
* The IDs of items that need to be indexed for the given index.
|
|
*/
|
|
public function getChangedItems(SearchApiIndex $index, $limit = -1) {
|
|
if ($limit == 0) {
|
|
return array();
|
|
}
|
|
$this->checkIndex($index);
|
|
$select = db_select($this->table, 't');
|
|
$select->addField('t', 'item_id');
|
|
$select->condition($this->indexIdColumn, $index->id);
|
|
$select->condition($this->changedColumn, 0, '>');
|
|
$select->orderBy($this->changedColumn, 'ASC');
|
|
if ($limit > 0) {
|
|
$select->range(0, $limit);
|
|
}
|
|
return $select->execute()->fetchCol();
|
|
}
|
|
|
|
/**
|
|
* Get information on how many items have been indexed for a certain index.
|
|
*
|
|
* @param SearchApiIndex $index
|
|
* The index whose index status should be returned.
|
|
*
|
|
* @return array
|
|
* An associative array containing two keys (in this order):
|
|
* - indexed: The number of items already indexed in their latest version.
|
|
* - total: The total number of items that have to be indexed for this
|
|
* index.
|
|
*/
|
|
public function getIndexStatus(SearchApiIndex $index) {
|
|
if (!$this->table) {
|
|
return array('indexed' => 0, 'total' => 0);
|
|
}
|
|
$this->checkIndex($index);
|
|
$indexed = db_select($this->table, 'i')
|
|
->condition($this->indexIdColumn, $index->id)
|
|
->condition($this->changedColumn, 0)
|
|
->countQuery()
|
|
->execute()
|
|
->fetchField();
|
|
$total = db_select($this->table, 'i')
|
|
->condition($this->indexIdColumn, $index->id)
|
|
->countQuery()
|
|
->execute()
|
|
->fetchField();
|
|
return array('indexed' => $indexed, 'total' => $total);
|
|
}
|
|
|
|
/**
|
|
* Helper method for ensuring that an index uses the same item type as this controller.
|
|
*
|
|
* @param SearchApiIndex $index
|
|
* The index to check.
|
|
*
|
|
* @throws SearchApiDataSourceException
|
|
* If the index doesn't use the same type as this controller.
|
|
*/
|
|
protected function checkIndex(SearchApiIndex $index) {
|
|
if ($index->item_type != $this->type) {
|
|
$index_type = search_api_get_item_type_info($index->item_type);
|
|
$index_type = empty($index_type['name']) ? $index->item_type : $index_type['name'];
|
|
$msg = t('Invalid index @index of type @index_type passed to data source controller for type @this_type.',
|
|
array('@index' => $index->name, '@index_type' => $index_type, '@this_type' => $this->info['name']));
|
|
throw new SearchApiDataSourceException($msg);
|
|
}
|
|
}
|
|
|
|
}
|